Seriously, what's the thing with skytest?
Stage 2 is designed for you to come in without knowing anything about the tests. I wouldn't be at all suprised if the test score takes into account how much you learn during the tests so they know if you are able to learn quickly.
If you really want to practice for stage 2, play some tetris. It won't help you a bit on the day but it'll keep you busy and it's good fun. Then get a good night's sleep and do your best, if you have what it takes and do your very best that should be enough.
Rant over...